...Joan Watson, will return for a second season Sept. 26. Not much has been revealed about the upcoming episodes, but RhysIfans ("The Amazing Spider-Man") appears in the London-set season opener as Sherlock's brother Mycroft.NBC...

...but in a case that eventually has ties to MI-6. Plus, Watson reexamines her relationship with Holmes and Mycroft (RhysIfans)."Maron" (9 p.m. on IFC, cable channel 616): The second season opens with Marc sabotaging a spot on "Talking...

...marriage, fleeing from the law and trying to be the life of the party."Elementary" (9 p.m. on CBS): Mycroft (RhysIfans) shows up for a surprise visit, causing conflict between Sherlock and Watson (Jonny Lee Miller and Lucy Liu) as they...

...boyfriend (Matt Lauria) returning to town."Elementary" (9 p.m. on CBS): Sherlock and Watson (Jonny Lee Miller and Lucy Liu) travel to London, where they meet his brother Mycroft (RhysIfans).So, what are you watching?

...Samuel L. Jackson, meets up with Liverpool lad Felix, played by Robert Carlyle, and Wacky Sociopathic Hijinks ensue. RhysIfans has a small part as a drug-dealing, gun-trafficking would-be yoga student. Jackson, Carlyle and Ifans dine on...

...Washington, D.C. in the season finale."Elementary" (9 p.m. on CBS): Holmes and Mycroft (Jonny Lee Miller and RhysIfans) must work together on a case with life-or-death consequences."Black Box" (9 p.m. on ABC): The team investigates...